By electric train
Since the February 15, 2015 the official carrier on the railway route
from Kazan (central railway station) to
Kathan International Airport ("Airport Kazan" station)
is OJSC company "Sodrugestvo".
More information about timetable of electric train You can get on the page "Transportation routes" of official site of Kazan-host city of the 2018 FIFA World Cup.
More information about carrier You can get on the official site of the carrier.